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first,PCB as printed circuit boardIt mainly provides the interconnection between electronic components. There is no direct relationship between color and performance, and different pigments will not have much impact on electrical performance. However, the performance of PCB is determined by the materials used (high Q value), wiring design and several layers of boards. In the process of PCB washing, black is the most likely to cause color difference. If the raw materials used by the PCB factory are slightly different from the manufacturing process, the defective rate of PCB will increase due to color difference. This directly leads to an increase in production costs.

In fact, the raw materials of PCB are ubiquitous in our daily life, that is, glass fiber and resin. The combination and hardening of glass fiber and resin have become a kind of heat insulation, insulation, and not easy to bend plate, which is the PCB substrate. Of course, the PCB substrate made of glass fiber and resin alone cannot transmit signals, so the manufacturer will cover a layer of copper on the surface of the PCB substrate, so the PCB substrate can also be called copper clad substrate.

How to judge the quality of multilayer PCB circuit boards from color

Because the circuit wiring of black PCB is difficult to identify, it will increase the difficulty of maintenance and commissioning in the R&D and after-sales stages. Generally, if there is no brand with strong RD (R&D) designers and strong maintenance team, black PCB will not be used easily. It can be said that the use of black PCB is a manifestation of a brand's confidence in the RD design and post-maintenance team. From the side, it is also a manifestation of the manufacturer's confidence in its own strength.

For the above reasons, all major manufacturers will carefully consider when selecting PCB design for products. Therefore, most of the products with large market shipments that year used red, green, or blue PCBs. Black PCBs can only be seen on mid to high-end or top flagship products, so customers should no longer think that black PCBs are better than green PCBs.